Now when I want to set a HIGH signal to that GPI, can I connect it with
BBBs 3.3V directly

Yes.

or is a resistor needed in order to keep this 8 mA
sink limit?

No. (You must observe the 8 mA limit, but connecting a GPIO to the 3.3V or gnd rails will not require anything close to 8 mA.)


-Mike

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